Abstract: Disclosed is a surface coated member having excellent adhesion resistance and fracture resistance. A surface coated member (1) comprises a coating layer (3) on the surface of a base (2). The coating layer (3) is composed of a multilayer body wherein a titanium carbonitride (TiCN) layer (4), a continuously existing intermediate layer (5) containing titanium, aluminum, carbon and oxygen and having an average film thickness of 5-30 nm, and an a-aluminum oxide (Al2O3) layer (9) composed of aluminum oxide (Al2O3) having an a crystal structure are sequentially formed by deposition.

Abstract: A surface coated cutting tool comprises a substrate and a hard layer formed on the surface of the substrate, and a contact angle of water ? on the rake face of the hard layer is in the range of 30 to 80°. A surface coated cutting tool comprises a substrate and a hard layer formed on the surface of the substrate, and a contact angle of water ?R on the rake face of the hard layer and a contact angle of water ?F on the flank face of the hard layer have a relation of ?R<?F. Thereby, excellent resistance to wear and fracture can be shown, leading to a excellent surface coated cutting tool.

Abstract: Disclosed is a cutting tool having excellent wear resistance. Specifically disclosed is a cutting tool having a substrate and a coating layer formed on a surface of the substrate. The cutting tool is characterized in that the substrate contains at least cobalt; the coating layer includes at least a titanium nitride layer formed on the surface of the substrate, a titanium carbonitride layer formed on the surface of the titanium nitride layer, an intermediate layer formed on the surface of the titanium carbonitride layer and an aluminum oxide layer formed on the surface of the intermediate layer; the intermediate layer contains at least oxygen and titanium, and the aluminum oxide layer incorporates particles composed mainly of cobalt.

Abstract: The surface coated member comprises a substrate and a hard coating layer coated on the surface of the substrate. The hard coating layer comprises a lower layer composed of at least one layer and an upper layer composed of at least one layer and coated on the surface of the lower layer. When FU stands for a peeling load under which the upper layer starts to peel away from the surface of the lower layer and FL stands for a peeling load under which the lower layer starts to peel away from the surface of the substrate, the ratio (FL/FU) is 1.1 to 30. Thereby, it is possible to obtain a surface coated member that has excellent toughness and high fracture resistance, and that can be applied to a long life tool having excellent fracture resistance even under severe cutting conditions such as metal cutting, e.g., steel cutting and interrupted cutting of cast iron that bring a strong impact on a tool's cutting edge. It is also possible to maintain excellent fracture resistance and increase resistance to wear.

Abstract: A cutting tool comprised of a cemented carbide is provided. The cemented carbide is consisted of a composition including: a predetermined amount of at least one selected from specific carbide, nitride, and carbon nitride, except for cobalt and niobium; 0.01 to 0.08 mass % of oxygen; and the rest consisted of tungsten carbide and unavoidable impurities. The cemented carbide is further made up of a structure in which a tungsten carbide phase and a B1-type solid solution phase being expressed by M(CNO) or M(CO) where “M” is at least one selected from the group consisting of metals of the group IV, V, and VI in the periodic table, containing niobium as being essential, and containing oxygen at a rate of 1 to 4 atomic % are bound by a binder phase composed mainly of the cobalt. This achieves the cutting tool having a long tool life in high-speed interrupted cutting.

Abstract: [Problems] To provide a cutting tool consisting of a hard material improved in the adherence between a substratum of cemented carbide having hard phases bound by a binder metal and a TiN layer superimposed on a surface of the substratum, and provide a process for producing the same. [Means for Solving Problems] There is provided a cutting tool consisting of a hard material, characterized in that the hard material has a substratum containing hard phases and a binder metal and a TiN layer superimposed on a surface of the substratum, and that the substratum has ?-phases consisting of at least one solid solution of carbide, nitride or carbonitride containing W and at least one member selected from among Ti, Ta, Nb and Zr, and that at least some of the ?-phases lie at a surface of the substratum, and that the TiN layer has crystals with the same orientation relationship as that of ?-phase crystals just above the ?-phases of the substratum surface.

Abstract: The surface coated member comprises a substrate and a hard coating layer coated on the surface of the substrate. The hard coating layer comprises a lower layer composed of at least one layer and an upper layer composed of at least one layer and coated on the surface of the lower layer. When FU stands for a peeling load under which the upper layer starts to peel away from the surface of the lower layer and FL stands for a peeling load under which the lower layer starts to peel away from the surface of the substrate, the ratio (FL/FU) is 1.1 to 30. Thereby, it is possible to obtain a surface coated member that has excellent toughness and high fracture resistance, and that can be applied to a long life tool having excellent fracture resistance even under severe cutting conditions such as metal cutting, e.g., steel cutting and interrupted cutting of cast iron that bring a strong impact on a tool's cutting edge. It is also possible to maintain excellent fracture resistance and increase resistance to wear.

Abstract: A cutting tool comprised of a cemented carbide is provided. The cemented carbide is consisted of a composition including: a predetermined amount of at least one selected from specific carbide, nitride, and carbon nitride, except for cobalt and niobium; 0.01 to 0.08 mass % of oxygen; and the rest consisted of tungsten carbide and unavoidable impurities. The cemented carbide is further made up of a structure in which a tungsten carbide phase and a B1-type solid solution phase being expressed by M(CNO) or M(CO) where “M” is at least one selected from the group consisting of metals of the group IV, V, and VI in the periodic table, containing niobium as being essential, and containing oxygen at a rate of 1 to 4 atomic % are bound by a binder phase composed mainly of the cobalt. This achieves the cutting tool having a long tool life in high-speed interrupted cutting.

Abstract: A surface coated cutting tool comprises a substrate and a hard layer formed on the surface of the substrate, and a contact angle of water ? on the rake face of the hard layer is in the range of 30 to 80°. A surface coated cutting tool comprises a substrate and a hard layer formed on the surface of the substrate, and a contact angle of water ?R on the rake face of the hard layer and a contact angle of water ?F on the flank face of the hard layer have a relation of ?R<?F. Thereby, excellent resistance to wear and fracture can be shown, leading to a excellent surface coated cutting tool.

Abstract: The surface-coated member 1 is constituted by coating the surface of the base body 2, made of such a material as cemented carbide or cermet, with the hard coating layer 3 that comprises at least one TiCN layer 4 and the Al2O3 layer 6 formed on the surface of the TiCN layer 4, wherein the TiCN layer 4 is constituted from stringer-like TiCN crystal grown in a direction perpendicular to the base body 2 and mean crystal width w1 of the TiCN layer 4 on the Al2O3 layer 6 side is made larger than mean crystal width w2 on the base body 2 side. This surface-coated member, as a cutting tool, shows excellent breakage resistance and high wear resistance with a long service life, where strong adhesion force of the hard coating layer can be maintained without experiencing peel-off between the TiCN layer and the Al2O3 layer even in cutting operations under harsh cutting conditions, such as intermittent cutting operation where the cutting edge is subject to strong impact.

Abstract: The surface-coated member 1 is constituted by coating the surface of the base body 2, made of such a material as cemented carbide or cermet, with the hard coating layer 3 that comprises at least one TiCN layer 4 and the Al2O3 layer 6 formed on the surface of the TiCN layer 4, wherein the TiCN layer 4 is constituted from stringer-like TiCN crystal grown in a direction perpendicular to the base body 2 and mean crystal width w1 of the TiCN layer 4 on the Al2O3 layer 6 side is made larger than mean crystal width w2 on the base body 2 side. This surface-coated member, as a cutting tool, shows excellent breakage resistance and high wear resistance with a long service life, where strong adhesion force of the hard coating layer can be maintained without experiencing peel-off between the TiCN layer and the Al2O3 layer even in cutting operations under harsh cutting conditions, such as intermittent cutting operation where the cutting edge is subject to strong impact.